I've had the greenhouse sealed up for about a week now and today I started working to dial in the greenhouse temps and humidity....
So far I've been just leaving all windows wide open with 3 good sized fans moving the air in a circular pattern around the greenhouse. During the day the temp has been staying about 5 degrees higher than the outside temp, and the RH has been about equal to outside, maybe a couple % higher.
The nighttime temps have been the same as during the day, about 5 degrees higher...
but the nighttime RH has been climbing to 85% - 95%. There's so much air moving through the greenhouse that the plants are staying bone dry throughout the night... and I haven't seen a single spot of mold... but I'd still like to drop the nighttime RH significantly ... especially as the buds fatten up.
Tonight, instead of leaving the windows wide open I opened them all to only about 2-3", and brought in the dehumidifier. At 8pm the temp was 66F and RH was 84%. As of just now, at 11pm, the temp is 65F and RH is 77% (outside 66F, 84%)... so I guess it's better then where it was, but I'd love to be able to keep nighttime RH in the 60-65% range... I'll have to keep an eye on it tonight and see what it does... I may also experiment with closing the windows even more.
Here are some pics if you're into that kind of thing....
DeeHuey at work
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LSD (Barney's Farm)
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Galaxy (Pyramid Seeds)
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Galaxy #2
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Jack Herer (Seedsman freebie)
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